TiO2-NaYF4:Er3+/Yb3+-C3N4 composite photoanodes were successfully designed for the first time. The photoelectric conversion efficiency of TiO2-NaYF4:Er3+/Yb3+-C3N4 composite cell can result an efficiency of 7.37%, which is higher than those of… Click to show full abstract
TiO2-NaYF4:Er3+/Yb3+-C3N4 composite photoanodes were successfully designed for the first time. The photoelectric conversion efficiency of TiO2-NaYF4:Er3+/Yb3+-C3N4 composite cell can result an efficiency of 7.37%, which is higher than those of pure TiO2 cell and TiO2-C3N4 composite cell. The enhancement of the efficiency can be attributed to the synergetic effect of NaYF4:Er3+/Yb3+ and C3N4. Electrochemical impedance spectroscopy analysis revealed that the interfacial resistance of the TiO2-dye I3-/I− electrolyte interface of TiO2-NaYF4:Er3+/Yb3+-C3N4 composites cell was much smaller than that of pure TiO2 cell. In addition, the TiO2-NaYF4:Er3+/Yb3+-C3N4 composite cell had longer electron recombination time and shorter electron transport time than that of pure TiO2 cell.摘要本文首次成功设计并得到以TiO2-NaYF4:Er3+/Yb3+-C3N4复合材料作为光阳极的染料敏化太阳电池. 与纯TiO2和TiO2-C3N4电池相比, TiO2-NaYF4:Er3+/Yb3+-C3N4复合电池的效率明显提高. 研究表明, TiO2-NaYF4:Er3+/Yb3+-C3N4复合电池的TiO2-dye|I3-/I−界面阻抗小于纯TiO2电 池. 此外TiO2-NaYF4:Er3+/Yb3+-C3N4电池具有更长的复合时间和更短的传输时间. 电池效率的提高归结于NaYF4:Er3+/Yb3+和g-C3N4的协同效应.